Backup power pack



FIG. 1 is a front view of a backup power pack showing our my design;

FIG. 2 is a left side view thereof;

FIG. 3 is a top elevation view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is right side view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a front, top and right side perspective view thereof. 

The ornamental design for a backup power pack, as shown and described. 